/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_BASE_CHRONO_UTILS_H
#define ANDROID_BASE_CHRONO_UTILS_H

#include <chrono>
#include <sstream>

using namespace std::chrono_literals;

namespace android {
    namespace base {

// A std::chrono clock based on CLOCK_BOOTTIME.
        class boot_clock {
        public:
            typedef std::chrono::nanoseconds duration;
            typedef std::chrono::time_point<boot_clock, duration> time_point;

            static time_point now();
        };

        class Timer {
        public:
            Timer() : start_(boot_clock::now()) {}

            std::chrono::milliseconds duration() const {
                return std::chrono::duration_cast<std::chrono::milliseconds>(
                        boot_clock::now() - start_);
            }

        private:
            boot_clock::time_point start_;
        };

        std::ostream &operator<<(std::ostream &os, const Timer &t);

    }  // namespace base
}  // namespace android

#endif  // ANDROID_BASE_CHRONO_UTILS_H
